GM Service Manual Online
For 1990-2009 cars only
Figure 1:

Power, Ground, Serial Data, and Transfer Case Encoder Motor


Object Number: 1923657  Size: FS
Master Electrical Component List
Transfer Case Description and Operation
Control Module References
Speed Signal, Front Axle Actuator and Indicators
Figure 2:

Speed Signal, Front Axle Actuator and Indicators


Object Number: 1923659  Size: FS
Master Electrical Component List
Transfer Case Description and Operation
Control Module References
Power, Ground, Serial Data, and Transfer Case Encoder Motor08 Envoy Power, Ground, Serial Data, and Transfer Case Encoder Motor